79879992637 has 2 divisors, whose sum is σ = 79879992638. Its totient is φ = 79879992636.

The previous prime is 79879992589. The next prime is 79879992701. The reversal of 79879992637 is 73629997897.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51687567801 + 28192424836 = 227349^2 + 167906^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-79879992637 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79879992737) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39939996318 + 39939996319.

It is an arithmetic number, because the mean of its divisors is an integer number (39939996319).

Almost surely, 2^79879992637 is an apocalyptic number.

It is an amenable number.

79879992637 is a deficient number, since it is larger than the sum of its proper divisors (1).

79879992637 is an equidigital number, since it uses as much as digits as its factorization.

79879992637 is an evil number, because the sum of its binary digits is even.

The product of its digits is 648121824, while the sum is 76.

The spelling of 79879992637 in words is "seventy-nine billion, eight hundred seventy-nine million, nine hundred ninety-two thousand, six hundred thirty-seven".